Fig. 3
From: Using Positively Charged Magnetic Nanoparticles to Capture Bacteria at Ultralow Concentration
Illustration of the procedures of bacteria capture. E. coli in suspension are respectively mixed with NP+ and NP−, followed by 10 min incubation. The “magnetized” bacteria were attracted onto the wall of the vial by a magnet. After the removal of the remaining solution, bacteria were captured by NPs, washed using PBS, and counted from the number of the bacterial colonies